to what extent did social justice movements of the late 1960s and 1970s adopt strategies of the Civil Rights Movement​

What is the purpose of the system of checks and balances

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment

Who did the first work in creating vaccines